Analyte sensor
Systems and methods of use for continuous analyte measurement of a host's vascular system are provided. In some embodiments, a continuous glucose measurement system includes a vascular access device, a sensor and sensor electronics, the system being configured for insertion into communication with a host's circulatory system.
1. A continuous analyte sensor system, comprising:
a continuous analyte sensor configured to generate a signal associated with an in vivo analyte concentration when the sensor is implanted in the host, and;
sensor electronics configured to process the signal, wherein the sensor electronics comprise a fail-safe module configured to
perform a steady state analysis and a transient analysis of the signal,
evaluate a relationship between the steady state analysis and the transient analysis, and
detect a malfunction of the system.
2. The system of claim 1 , wherein the fail-safe module is further configured to detect an electrical malfunction.
3. The system of claim 1 , wherein the malfunction is associated with at least one of start-up and sensor break-in.
4. The system of claim 1 , wherein the fail-safe module is further configured to detect a sensor malfunction.
5. The system of claim 4 , wherein the sensor malfunction comprises at least one of noise on the signal, drift of a sensitivity, drift of a baseline of the sensor, a broken component of the sensor, blood clotting on a portion of the sensor, and cross-talk.
6. The system of claim 1 , wherein the fail-safe module is further configured to perform a waveform analysis of the signal.
7. The system of claim 1 , wherein the fail-safe module is further configured to provide at least one of an alert, an alarm and an instruction.
8. The system of claim 7 , wherein the fail-safe module is further configured to evaluate a detected malfunction against a criterion.
9. The system of claim 1 , wherein the analyte is glucose.
10. The system of claim 1 , wherein the steady state analysis is performed when the signal is substantially stable.
11. The system of claim 1 , wherein the steady state analysis is performed when the signal is representative of the analyte concentration.
12. The system of claim 1 , wherein the transient analysis is performed during a period of signal artifact.
13. The system of claim 1 , wherein the transient analysis is performed when the signal is undergoing a measurable rate of change.